Lustrous thread.



' I No Drawing.

PAUL iamvml'rn,- or MULHEIM, NEAR... COLOGNE, AND sans-r Dam AND o'rro Sm. PHANI', or ELBERFELD, GERMANY, ASSIGNORS TQ V'FARBENFAB'RIKEN vonm.

rnrnnn. BAYER & 00.,- or ELBERFELD, GERMANY, A conronarron or GERMANY.

' LUSTROUS THREAD. I

- 1,031,616. Specification of Letters Patent.

To all whom it may concern:

Be it known that we, PAUL BENRATH, residing at Mulheim, near Cologne, and Enns'r DAMM and Or'ro STEPHANI, residlng at Elberfeld, in the Kingdom of Prussla, Germany, citizens of the German Empire, have invented new and useful Improvements in Lustrous Threads, of which thefollowing is a specification.

To produce threads, bands, etc., having a metallic luster, it has been necessary heretofore to wrap threads of metal around textile threads. The chief drawback to this process is the difficulty of producing a firm adhesion of the metal to the thread, and lustrous threads prepared in ,this manner are not very durable. We have now found that, according to the process hereinafter described,

threads having a metallic luster can be ob tained' in which the metal producing the luster adheres firmly to the threads.

To produce our new lustrous threads,

threads spun from cotton, flax, wool, silk, gum or metallic threads, wires or bands are passed through a mixture of metallic bronzes or powders with solutions of cellulose acetates with or without the addition of other suitable pigments to insure a homogeneous mixture of the bronzes with the solutions. The threads on emerging from this mixture are then finished by polishing, pressing, filing, etc.

Example 1 A cotton thread is drawn slowly through chloroform containing in solution 5 per cent. of acetylized'cellulose (see United States Letters Patent 790565) and in suspension 15 per cent. of goldbronze. The thread on emerging from the chloroform is wound up.

Example 2: A cotton thread is drawn through a solution of acetylized cellulose and is then drawn-slowly through acetone containing in solution 10 per cent. of acetylized cellulose (see British Letters Patent 24067 of 1906) and in suspension 30 per cent. of copper bronze. The thread on emerging from the acetone is then drawn through a third solution of acetylized cellulose and wound up. I

This new material splits 0E acetic acid if it is digested for several days with dilute sulfuric acid, On distillation with steam,

Application filed October as, 1909. Serial No. 525,175.

. UNITED STATES T NT orrron.

Patented July- 2, 1912.

acetic acid distil's over and the quantity of it may be ascertained by titration or by any other known'method.

' On using dyed bronzes or a solution of the acetylized cellulose containing a dye various shades can be obtained.

Where threads or bands are thus treated,

the adhesion of the acet lcellulose thereto is greatly. enhanced by t e presence of themetal powder in the ester coating. This isdue in part to the fact that the rate of expansion and contraction of the coating as a whole is brought nearer that of the core;

and this is especially true where the core is a metal thread. With cores of cotton, silk,

each incased by and incorporated with the set but elastic and flexible acetylcellulose,

'The coating may appear continuous, but

there is substantially no actual contact between the metallic particles by reason of the intervening ester 'film linking adjacent particles. As a result, the metallic finish coating of threads made in'this way, whether with metallic or non-metallic cores, is consequently exceedingly flexible as well as adherent. V

For the purposes of the present invention, the core of the new'lustrous thread may be of any permeable material capable of being impregnated with the acetyl cellulose .solution to an extent suflicient to give the type of locln'ng union between core and coating herein contemplated.

We claim:

1. As a new article of manufacture, a lustrous thread comprising a core of permeable material provided with a coating of acetylcellulose in which is incorporated a metal powder, said coating being firmly locked to said core.

2. Asa new article of manufacture, a lustrons thread comprising a thread of fibrous material prorided with a coating of acetylcellulose inwhich is incorporateda metal I powder,saidcoating being firmly locked to 4. As a new-article of manufacture, a lustrousthread comprising acore of fibrous material provided with a coating offacetylcellulose firmly locked thereto, said coating containing incorporated jmetal' powder and coloring matter.

In testimony whereof we have hereunto .15 set our hands in the presence of-twosubscribing witnesses.

PAUL BENRATH; [1 s.]

ERNST DAMM; [L. s.] OTTO STEPHANI. [11.5.].

Witnesses: O'rro KGNIG,

CHAs. J. WRIGHT. 

